Method of treating porous masses



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'tion, highly elastic colorless masses result which are unusually ecidproof and highly resistant to the action oicaustlc alkali. The describedsolutlons are therefore particularly suitable for use in improving thequality of various porous messes such as paper, wood, felt, asbestos,and the like,

' and more particularly for use as a dressing medium in the treatmentand finishing oi textile fibers and fabrics.

In place of these solutions, it is also possible to use mixtures thereofwith other artificial resin solutions which are console oi hardening.This feature is of significance, not only tor the reason that theproducts derived from hye are somewhat expensive, but also because theyare capable of imparting their valuable properties in a surprisinglyhigh degree" to xed products, even when they are present in these mixedproducts in relatively small quantities. For ex ample, if resinsobtained from urea or thiourea and formaldehyde be mixed with evenslight proportions of solutions of the hydrsso resin, the particularlygreat adhesive resistance and elasticity-es well as the resistance to,the action of acid of the hydrezo resin will nevertheless be imcarted ina high degree to the mixture.

Masses-oi comparatively great thicmiess or bulk are impregnated in amanner known per se, for example in vacuo, with the artificial resin.solutions concerned, and then hardened, with or without the applicationof pressure, preferably at a temperature of 130 to lit (3'. The massesthus obtained can be satisfactorily worked by niechanical methods, and'mssess high insulating value.

Paper can be successfully impregnated or coated with the solution, if aplurality of such layers are superposed upo'necch other, and thecomposite body thus converted, with the application of heat andpressure, into at shaped piece or body Y of laminated structure. A stripof paper coated on one side with the tie-tent d solution can he rloenter ll,

(on. ellilt) wound under tension, and with slmultoneous heating, upon amandrel in such a manner that a firm lapped tubing is obted'.

Porous, pulverulent, or finely fibrous meterieils,

such as cork meal,- asbestos, powdered wood, and the like, can be mixedwith the solutions, after which the nasty mass thus obtained can be upplied to a, metallic or other substratum end there hardened by heat,with or without the application of pressure. Acid-proof coatings areobtained in this nner upon the substratum or other ioun datlon surface.Smell mica plates or flakes may also he held together with the aid oithe described artificial resin solutions, and then converted into issolld composition by the appliesproperties.

Falorics msy he irnprecnatecl with o hot or cold solution of the resin,then pressedin the usual manner, dried, stretched and finished. Theeilect of the dressing can be veried Within very Wide limits, rangingfrom herd stifieninc' to elastic finish. The latter of finish isparticularly valuable for y purposes, since for eple in this mannercellulose ulcers can be improved so that theyocquire the some resistanceto creasing and cmmpling as wool or natural sills.

. If s fabric be impregnated with the described mixture of resins, theproperties of the hydrazo resin, such as resistance to we cut, softness,

and resistance to the action of acid end ulkuli are neverthelessrealized in a high degree in. the mixture oi the resins, even when thehydrate resin is added only in. a proportion of -20%. Particularlyfavorable results are obtained wit the use of hydrotropic wettingagents.

The two resin solutions can he produced sew arstely, end applied to thefabric seperately or coniointly. The textile fiorescan however also bebrought directly into contest with a solution into which the startingmaterials of the resin or resins have been introduced, before the resintrying reoction has sterted. In this case the resins or theirintermediate products are produced in the textile bath or on the fibreitself, as for 7 example when hysine and tires, which may serve asstarting materials for the production of the hydraso-dicarhomlamide, arecaused to react directly with. the formaldehyde in the textile hath. Itis immeteriel to know in this connection whether the formaldehyde reactsonly with the hy drazo-dicarboxyde evolved in the second stage of thereaction hen the starting materials, or whether it reacts also with thesemiid tion oi pressure and heat. The materiel obtained 4 in this-mannerhas excellent electrical insulating carbazide evolved in the first stageof the reaction of urea and hydrazine. With this method of workingparticularly soft impregnations are obtained.

The production of these masses is effected, for example, as follows:

(1) 118 grams of hydrazo-dicarboxylamide are dissolved hot in 375 ccs.of formaldehyde of 40% strength (by volume), 50 cos. of normal causticsoda solution, and 500 ccs. of water. The solution is then cooled,filtered, andHCl added until the solution shows a weak acid reaction onCongo. The solution is then diluted with water up to a total volume of1200 ccs.

A fabric of cuprammonium silk is steeped in this solution, kneaded inthe usual manner, spread out horizontally under tension, and finallyhardened in a heated chamber at a temperature of 120 C. After soaping, afinished fabric is obtained which is resistant to creasing and crumplingand also resistant to the action of acids and alkalies.

Masses such as paper, wood, felt, asbestos, pressed compositions, andthe like can also be treated with the same solution. The productsthereby obtained are more elastic than they would otherwise be, haveuseful insulating properties, and are likewise resistant to the actionof acid and alkali.

(2) Two solutions are made up as follows:

B0110 acid 16 These ingredients are boiled under a refiux condenseruntil a sample does not become turpid on cooling.

Solution B Hydrazo dicarboxyl amide grams 32. 6 Formaldehyde do 65. 3Water ccs- 88 Normal caustic soda solution -do 10 These ingredients aredissolved under a reflux condenser, and then neutralized withhydrochloric acid, cooled and filtered. Solution A is then mixed withSolution B and incorporated as described with porous masses such aspaper, wood, iielt, asbestos, textile fibers, textile fabrics and theke. I

(3) A viscose crpe-de-chine is impregnated with a solution of 15 gramsof hydrazo dicarboxyl amide, 85 grams of urea, 250 cos. of 40%formaldehyde, and 1 cc. of formic acid in 650 cos. of water, then wrungout, dried, and heated for a short time at 130" C. After boiling withsoap, the fabric has a soft elastic finish. I

A strong cotton fabric is impregnated in the same manner aftermercerizing, although it is preferable to add 2% of .the sodium salt ofa naphthalene sulfo acid condensated with formaldehyde referred to theweight of the fabric in the dry state. 1

(4) 15 grams of hydrazine hydrate, grams of urea. 250 ccs. of 40%formaldehyde, and 2 cos. of-caustic soda solution (36- Baum), aredissolved in 650 ccs. of water, and, after being left to'stand for sometime, acidulated'with 3 cos. of formic acid. A viscose orpe-de-chine isimpregnated with this solution and further treated as in Example '3.After boiling. with soap, an elastic firm finish is obtained.

(5) A viscose crpe-de-chine is impregnated with a solutionof 10 grams ofhydrazine hydrate, grams of thiourea, 250 cos. of 40% formaldehyde, and2 cos. of formic acid in 650 cos. of water, and further treated in themanner described in example 3. After boiling with soap, the material issoft and elastic to the touch.

I claim:-

1. The process which comprises incorporating with porous material asolution of at least one product obtained by condensing formaldehyde inthe presence of catalysts with a substance selected from the groupconsisting of: dicarboxylamides of hydrazine, substitution products ofdicarboxylamides of hydrazine, and mono-thio derivatives ofdicarboxylamides of hydrazine, and after the incorporation, hardeningthe condensation product by means of heat.

2. The process claimed in claim 1 using a porous material selected fromwood, felt, asbestos, textile fibres, and textile fabrics.

3. The process which comprises incorporating with porous material asolution containing formaldehyde, a catalyst, the starting materials forproducing a substance selected from the group: dicarboxylamides ofhydrazine, substitution products of dicarboxylamides of hydrazine, andmonothio derivatives of dicarboxylamides of hydrazine, and subjectingthe incorporated substances to the action of heat.

4. The process which comprises incorporating with porous material asolution containing formaldehyde, a'catalyst, urea, the startingmaterials for producing a substance selected from the group consistingof: dicarboxylamides of hydrazine, substitution products ofdicarboxylamides of hydrazine, and mono-thio derivatives ofdicarboxylamides of hydrazine, and subjecting'the incorporatedsubstanoesto the action of heat.

5. The process which comprises incorporating with porous material asolution containing formaldehyde, a catalyst, thiourea, the startingmaterials for producing a substance selected from the group consistingof: dicarboxylamides of hydrazine, substitution products ofdicarboxylamides of hydrazine, and mono-thio derivatives ofdicarboxylamides of hydrazine, and subjecting the incorporatedsubstances to the action of heat.

6. The process claimed in claim 3 using a porous material selected fromthe following: paper, wood, felt, asbestos, textile fabrics and textilefibres.

'7. A product comprising a porous product and incorporated hardenedcondensation product of formaldehyde and a dicarboxylamide of hydrazine.

8. A process for improving textile fibres and fabrics, more particularlyof cotton and artificial silk, consisting in treating the same with asolu' tion of a product obtained by condensing formaldehyde in thepresence of catalysts with a substance selected from the groupconsisting of: dicarboxylamides of hydrazine, substitution products ofdicarboxylamides of hydrazine, and monothio derivatives ofdicarboxylamides of hydrazine, removing the surplus solution, drying thematerial, and hardening the condensation product by heating.

9. A product comprising a porous product and incorporated therewith atleast one hardened condensation product of formaldehyde and a substanceselected from the group consisting of: dicarboxylami les of hydrazine,substitution prodnets of dioarboxylamides of hydrazine, and monothefollowing: paper,

thio derivatives of dicarboxylamides oi hydrazine.

10. A product comprising a porous product, in-

corporated therewith at least one'hardened conv densation product offormaldehyde and a substance selected from a group consisting oi: dicar-'boxylamides of hydrazine, substitution products of dicarboxylamides oi.hydrazine, and monothio derivatives of dicarboxylamides of hydrazine,and v at least one other colorless hardened artificial resin admixed tothe said condensation product 11. In a product as claimed in claim 10,the said colorless artificial resin being a condensation product offormaldehyde and at least one substance selected irom the groupconsisting of urea and thiourea.

i2. In a product as claimed in claim 9 the said porous product being amaterial selected from the following group consisting of: paper, wood,felt, asbestos. i

13. A creaseprooi material comprising a textile matter selected from thegroup consisting oi:

textile flbres and textile fabrics, and a thin him textile fibres andtextile fabrics, and a thiniilm consisting of a mixture 0! at least onehardened condensation product of formaldehyde and a substance selectedfrom the group consisting of: dicarboxylamides of hydrazine,substitution prodacts of dicarboxyla'mides of hydrazine, and monothioderivatives or dicarboxylamides oihydraaine, a of at least one othercoiouriess hardened artificial resin, covering each individual iibre orthe said textile matter, the interior 0! said fibres being left treefrom the said mixture.

15. In the process which comprises incorporating with porous material asolution containing at least one product obtained/by condensing.tormaldehyde in the presence of catalysts with a substance selectedfrom the sroup consisting of:

nets ofdicarboxylamides of hydrazine, and mono- I thio-derivatives ofdicarboxylamidesot hydrazine,

and after the incorporation hardening the con- 'densation product bymeans 0! heat, the step of incorporating at least one other colourlessartiil'-- cial resin to the said porous material at a time beforehardening the said condensation product and hardening said othercolourless artificial dicarboxylamides of hydrasinasubstitution prodiresin simuleouily with said condensation product.

16. m the time claimed in is the seal tional'colourless artificial resinbeing of the type.

obtained from formaldehyde and at least one of the substances selectediron the group consisting of: urea and thiorea.

17. In the process for improving textile fibres andiabrics, moreparticularly ior rendering cotton and artificial silk less liable tocreasing-and crumpllng. consisting in treating the unhurt fibres andfabrics with a solution of a product obtained by condensing iormaidehydein the presence of catalysts with a substance selected from the group 7consisting oi: diearboxylamides of hydrazine, substitution products ofdicarbomldes of hydrasine and monothio derivatives of dicarboxylamidesof hydrazine, removing the surplus solution, drying the material, andhardening the condensation product by heating, the step oi addi to thesaid solution at least one other coioriew artificial resin d hardeninsthe same simultaneously with the MFORGD

